Bag turning apparatus



May 12, l931- SPARKS 1,805,432

BAG TURNING APPARATUS May 1 2,` 1931. c. F. SPARKS BAG TURNING APPARATUS Filed July 25, 1928 4 Sheets-Sheet 2 May 12, 1931. Q F, SPARKS 1,805,432`

` BAG TURNING APPARATUS Sheets-Sheet 3 FiledkJuly 25, 1928 e? Q3 5 55 5f May 12, 1931. c. F. SPARKS BAGJURNING APPARATUS Filed July 25, 1928 4 Sheets-Shet 4 andflower connecting rod 29 controls the Y OP posed oscillating `or reciprocatory action of a lowerparall'el linkage or lower swinging` frame `33, each connecting rod4 being joined with its linkage by means .of a pin coupling 35. a

lThe lower swinging frame 33 comprises two preferably parallel armsr 37 pinned to each of the rear corner posts 3 and joined 1.3. at their outer ends by a connecting link 39 to form alparallel linkage on eachside ofthe lmachine, said parallr-rl linkage being joined bya pivot shaft 41 and two guide rods or rollers-43,r the guide rods 43 being located somewhat above the pivot shaft 41. pivot shaft carries pi'votally thereon connecting pieces 45 having right' angular pivot pins i f 47, whereby a universally movable support isprovidedfor each .of a pair of downwardly located, ball-end turning sticks 49, said sticks passing between'and being partially i fguidedby the guide rods 43. The turning sticks-49 arel further guided `bymeans of a pair of guide pulleys 51 and yokes 53 held in supporting pieces '55, the latter being held 'on another supporting rod 57. `The guides 'i 51, 53, 55 (takenas a whole) are adjustably f mounted` on they shaft 57:(see set screwsV 53) but in operation are rigid as to cross movement. f The turningsticks 49 are each given i the double curved shape shown best'in Figs.

2 and 3 by means of which said'sticks upon rising yare given a spreading vmovement at i the upper ends thereof as willrbe clear/by kswinging frame 33 under action ofthe con-4 examination of said Figs. 2 and 3. The ris-j ing action of the sticks, as well as J'falling action thereof, fis effected by the oscillatingy or reciprocatory'action ofthe lower necting rod 29 and its' revolving crank pin 25. It will be noted thatvif the guides are adjusted at a greater width than the pivot points of the lower ends of the "turning sticks,

that'ftlie upward 'movement vof a` pair of straight turning sticks kwill cause the points or ball ends thereof-to swing outwardly in thedirection of the width of the bag asin thecaseofr the curvedv turning sticks above described, Athis comprising an .alternative form.- i

The l upper swinging' frame 31r comprises v two arms 59, one pinned to eachof the rear f corner posts 3. These arms 59v 'are joined at their foifwaidendsby the rodr 63 upon which are lieldfouter holding sticksr65; Spaced from therod 63 is another iod 67,

the distance between the rods 63and 67 being such' as to' provide 'just enoug'hspace be,-

tween them to .permit sliding movement of` the'rk turning sticks '49 therebetween andthe turning of the bag therethrough. Ther inner holding-sticks 69rock'witli-'said rod 67 in the swinging frame`31, the rod 67 being provided'with a crank 71 which is normally held in the positionY shown in (Fig. 4) by The means of aV spring 73, thus normally holding the` sticks or arms away from each other. Control of the action of the inner swinging holding sticks 69 ishad by a bridle link 75 pivoted to one of said posts 3, said link having a slot 77 therein engaged by a pin 79 mounted on the crank 71. y Hence klas, the upper swinging frame 31 moves up and down,

.thepin 79 moves in the slot 77 which itself willbegcaused to'V swing rwith the swinging link 75. The length of the slot 7 7 is so ar-` ranged that for a certain fraction of the oscillation,.tlie pin 79 rides freely therein, but when a pre-determined descent has been effected on the down stroke of the frame 31, then ythe pin 79 engages with the left-hand end of the 'slot 77 so that the swinging holding sticks 69 are moved counterclockwise,

the spring 73 providing the necessary resiliency and tending to normally khold the holding sticks 65, 69 apart* or in open position, that is, yuntil abnormally acted upon at the 'end vof the 'slot 77. The purpose of the sticks together ata predetermined descent isfQto cause them to more readily enter the mouth of yabag, as will be seen hereinafter.

Afterv entry of the holding sticksy into the baginouth it is again desirable-that theyfapproach slightlyy at the end of the stroke and vrfor this 'purpose there isfprovided a second. bridle ylink 81 having a slot 83 engaging with a pin 85 located on a second crank 87, the crank 87 being fastened to said pivotal cross rod 67. Bythis means, as illustrated in 4, when the end of the stroke is reached,.the pin 85 engages the" rear end of slot 83 thus' slightly pushing the holding 4abnormalfaction in bringing the holding sticks together just sufficiently to relieve the A, is pivoted to the rear upright 3 and is pro- Uvided-with a connection with the pin 66, but

this connectionl is not a 'slotted one. ItV is anfordinary pin connection. The proportions of the parts jiistd'escribed are so chosen that the sticks 65 swing inwardly ,more Vat the top end of the stroke than they doy at the bottom end of the stroke thereby more readily entering the bag mouth npon descent, as well `f as assisting inpositioning the holding ofthe -bag at `the most favorable position for turning by theturnin'g points of the turn'- ing sticks. V

Adjustably mounted on a cross shaft 89 I in the main frame 1 are two pulleys 91.k

- last partof the stroke of the lowersticks f is effected, the turned bag yis released from saidk holding sticks and delivered in between the rolls or pulleys 93, 91 to be delivered outs' through rolls 105, 109.

- It will be seen that by means of the ,opposed Y action between the upper and lower swingingfframes and ,their respective sticks or arms, that maximum relative movement is effectedv with minimum Vabsolute movement of each. `This results in ashorter andmore compact machine, because the crank throw `of pins 21,25 needs'be only one half as long as if all the movement were applied'to one frame or set of sticks or arms. The parallelof l gram-frame mountings for the turning and holding sticks or arms provide simpliiied rmeans Without sliding pairs formaint'aining r,substantial parallelism between the sticks.

'spreaders 115. Automatic means may also c be vused,;such as illustrated in Figs. 6to 8.

In the above, a manual method has been describedV for` placing thel bags over the In this modification a table 111 is provided with'the described means including the ele-v .ment 113 for holding the bags with their t operatedlto reciprocate by means of a conf 'upper portionsV lying laterally. The cross support 139 Ipivotally carries said spreaders 115, said spreaders having tail pieces 150 held together by a tension spring 152 such that the normal tendencyof thespreaders is to separate. However, cranks 154 fastened to the lower 'ends of the pivot pins 117 of thef spreaders and coupled to a cross head 156 by meansof connecting rods 158,*prevent the normals reading action of the springv 152 fromtaking'place. The crossl head `156is necting rod 160 having a lost-motion engagement with a rocker arm'162, thenlatter hav.- ing alost-motion engagement with the con'- necting rod `164 which is operated from said oscillating pieces 59 of the oscillating frame 31 by vmeans of an extension 166. It will be comprehendedthat as the frame 31 moves up anddown that the described mechanism causes the spreaders 115. tofopen and close.

y They spread apart or openwhen the frame 31 descends for turning a prior bag, and they returnto closed position when the frame 31 -again rises. (See Fig. 6.) l

.n In order to place the mouth of a bag in y open positionfor entry of the spreaders 115y therein, there is pivoted to the same pivot pin :as rocker-`162, a gooseneck 168 which, however, -is not `oscillable directly with said ik rocker v162 but only indirectly in the following manner; Theouter end of the goose neck 168 com'- prises one fixed jaw 170 of a pairof pinchers, theother-jaw 172 thereof being swingable with respect to said fixed or main jaw 170.' "The tailend of the movable jaw 172 is vlinked tof the rocker 162 by means of a connectin'g rody 174, An adjustable stop 176 As the upper frame 31 descends yand the y rocker 162 is moved outwardly tothe Fig. 7

position, the next action in regard to the `pinchers is a closing movement of the movable'jaw 172. Inasmuch as the two jaws 170,

i 172 vmerely rest uponthe stack of bags and are'm'ade rough, the result is first a wrinklingup of av layer of cloth onthe .top side onlyrof the topmost bag which is frictionally pinched by saidjaws as theyclose. vAfter the jaws are Aclosed completely on'the pinched cloth, theiry further relative ,movement is prevented, whereupon the action of the connecting rod 174` is to pick up the goose neck 168 as illustrated in Fig. 7. This means that oneside of the bag is still lying on the stack and the other is picked up so that the mouth thereof isopened ahead of the then `closed spreaders 115.' The action isv so t synchronized, as illustrated in Figs. 6, 8, that after the ,oneside' of thelbag has been-lifted the predetermined distance the spreaders spring outwardly yto passinto the 'mouth of the bag andgrip the bag for the purpose of delivering the bag to the turning stick, thatis, by means Aof the fingers 125, 129 as hereinbefore described. The action of the spreaders in spreading vthe bag is to pull the gripped wrinklepof cloth fromfbetvveen thekjaws 170,172

and hold the bag fory further action by they n langers 125, 129.

attained. p Y

yAs many' changes could be made in carrying'out the above constructionswithout departing from the scope of theinvention, it is intended that all matter contained in the above." description or shown in the accompanying drawings shall be interpreted as illustrative yand not in a limiting sense.'

' I'claim: Y 1. In' bag turning apparatus, reciprocatory ymeans" Vrcarrying pivoted vsticks adapted to turn bags, means for sl'lvpporting and guiding said sticks, said sticks being curved so as to provide a predetermined movement thereof lll throughithe p guiding means ivhile the bags. f

2. In means, means for adjustably pivoting sticksy cause themto spread asv bagsareturned.V

vlo

3-.xIn bag turning apparatusjfturning 'meanshaving reciprocatory movement, holding means valso having rec iprocatory'Amove-sV ment, saidtvvo movements rofthe turning and holding meansjbeing opposed, whereby enough relative Y movement I eie'cted between saidmeans forturnin'gl a bagfb/u't the@V absolute movementf of each means fis less,y Vthan the length of the bag, said opposed move-1 vments being effected by ardoubleopposed crank and connectinglinliages. Y. j

1i. In bag aturning* apparat j means having reciprocatory. movement, holdf Y mg means also having reciprocatory move-1 ment, said tvvo movements of the turning and holding means being' opposed; linkages `lfor mounting the turningandL holding meansre f spectively, a doubleopposed cranln landgcon-J l neet-ing rods from said crank to said linkages. I

v:`5.=In,1'bafg' turning' apparatus,jturning j y, Y, A

' jsecutively,andgalinkage in norm-al operation,k

.causing the. pincliers, to pinchv up a .portion means having reciprocatory movement,` holding means alsov khaving reciprocatory movement,1said two movements oftheturningv yand'holding means beingfopposed, whereby Y enoughrelativezmovement is effected between said means for turning a bag but tli'eabsolute movement 0ic 'each means'vris less than vthey length! o the bag',j means 'for taking a bag from the turning and holding `means` after turning has been accomplished Sandr de'liverl.:`

ing 'it from the machine, said holding means 'being adapted toy release the bag` as turning is completed and automatic ineanstor taln'ng a bag from' a4 supply and positioning` itso asl to be acted' yupon''bygsai'd4 holding and f turning means. Y.

` 6. In bag l ing means also having recip'rocatcry` movementjsaid. tvvoV .movements ofthe "turningf Y n o ,o j

'f namey to this `and holding means "being opposed'fvvhereby enough'relative movementLis efi'ectedfbetvveen i 55 `from the turning and holdingpm'@MISVK Litera? Y f bag turninglapparatus, `reciprocatory *Y us, v turninggV Y j Y,

preventing movement of thesecond jaw with -respect't'othefmain javv until the main j aw: 1 has :descended .uponthe bagand preventing; g lifting of thejgmain `javv "from" the bag until j Y turning apparatusjfturning means having reciproc'atorymovement, hold- July, 1,928.55 e

Ying means passing* betvwaen"y the holding Ameans and'iup to saidj delivery means.

' 7;'In bagturningffapparatus,meansffor automatically c openingv f a Vbag f comprising .o )i

mainy jaw adapted to approach and recede??V means for supporting the ybag, a swingable romthe bag,`a Second j avv.v movable on the main jauge rockena` connectin'gfrodbetween Y i Y therrocker' .and said second jawfwhereby the jaws yopen-1[automatically only: after'V movementfof the-main javv ytoward kthe bagsui I face has been completed andl .whereby reced ing 111,93?lfltfawayV from ythe bag surface canV 'Y Start onlyafterjpinching' moyemelpcr of SaidV VK Ii, p

, Symeansfor 1 automatically.opening airbag .Comprising .j

jaws fhasfbeenacompletedl* Y,

-meanswforsupportinggthelbag, a svvingable main jaw, and/a linkage in normal operation "relative jmvovenient "of the` jaws o has ceased.

VV9; In baghandling-- apparatus, Vmeans fory mainfjavv adapted to V"approach and `recede i' from the bag, a second movable on the 785 supportingya stack ofbags, 'pinchers, means'.r

for applying/the pinchers y,to the bags conof the topmostfzbag, preventing pinching movement untilpinching been completed.

automatically vopening ai bagfocomprising l means] for supporti-ng the 'bag,' a svvingable A 'i main javvladapted to `approach and recede from therbag, agsfe'cond javv movableffon the main jawgfvmeans for'determiningthe-move#I Y 'ment' ofjthefsecon'd -javvwith respect tothe n l Intestimony whereof, I` have signedmy -oiiiARLEs' sin@misil.'`

turning has been accomplished anddeliver# ing it fronfithemachine, said holding :means-Q A Y being adapted to release the bag fasturningL 1 'mi iscompleted'and automaticmeans ortalring` Y a bag roma supply and'gpositioning itvvvith 'Y l fopenfmoutlibetWeenlthefends of the holding and turning means, saidholdingland-turni f i Y y ing'means `-passing,through the -bagmouthf i' fromvabove andbelow 'respectively;` theturnlf speciiication 9th "day 

